ABB 266 HART Series, Operating Instruction

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2600T Series Pressure transmitters | OI/266/HART-EN Rev. M 37
8 Operation
8.8.2 Standard HART
Standard HART protocol is available on 266Dxx, 266Hxx (with
the exception of ranges V and Z), 266Nxx. Standard HART
version of 266 features 4 dip switches on the integrated LCD
display.
Switch 1 and 2 are for Fail Low/Fail High selection.
Switch 3 identifies the external push buttons functionalities:
Zero/Span adjustments or PV Bias-Offset / PV Bias Reset
(Z and S letters in the lower corners of display change
respectively to B and R).
Switch 4 allows user to enable the write protection.
Dip switch functions are as follows:
Fail mode (switch 1 and 2)
By moving dip switch 1 in up position, operator can enable
hardware failure direction functionality of dip switch 2.
Hardware failure direction selection cannot be modified trhough
LCD, HART Handheld terminals or DTM.
If the user wants to modify the factory-defined parameter for
the fail safe output condition in case of transmitter failure, it is
necessary to put dip switch 2 in up position. Consequently, the
output will go Downscale. Here below fail safe values:
in down position the output is driven upscale (High alarm 21mA)
in up position the output is driven downscale (Low alarm 3.6mA)
Push buttons mode (switch 3)
Dip switch 3 is set at the factory in down position. This means
that the external push buttons perform the zero/span
adjustments. If the user puts this switch on up position, the
zero push buttons will modify the PV Bias-Offset and the span
push button will act on the PV Bias-Offset value.
Write lock (switch 4)
If the user wants to protect the configuration from unauthorized
writing, dip switch 4 has to be moved up in up position. Dip
switch 4 is unused when option R1 is selected for Standard
HART version and the write protection is by external button.
8.9 Configuration of the pressure transmitter
using the optional LCD HMI with keypad (menu-
controlled)
The integral LCD option (L1 or L5 option) is connected on the
266 Advanced HART communication board. It can be used to
visualize the process measured variables as well as to configure
the display and the transmitter.
In addition, diagnostic information is provided. To access the
functionality of the HMI an activation procedure needs to be
carried out. The keypad activation procedure is different
between the TTG (Through-The-Glass) L5 option and the
conventional L1 option integral LCD.
Figure 49: Display keypad of L1 and L5 LCD display options
The keys (1) , (4) , (2) and (3) are available for the
menu-controlled configuration.
— The menu/submenu name is shown at top of LCD display.
— The number/line of the currently selected menu item is
displayed in the upper right of the LCD display.
— A scroll bar is located on the right edge of the LCD
display which shows the relative position of the currently
selected menu item within the menu.
— Both of the keys (1) and (4) can have various
functions. The meaning of these buttons is displayed
below in the LCD display above the respective button.
— You can browse through the menu or select a number
within a parameter value using both keys (2)
and
(3) . The button (4) selects the desired menu item.
Button (1) functionalities Meaning
Exit Exit menu
Back Back one submenu
Cancel Exit without saving selected parameter value
Next
Select next position for entering numerical val-
ues or letters
Button (4) functionalities Meaning
Select Select submenu/parameter
Edit Edit parameter
Ok
Save selected parameter and display
stored parameter value
The integrated LCD display (LS option) is located in the housing
compartment with windowed cover of 266 Standard HART
version. It can be used to visualize the process measured
variables as well as to configure the transmitter as allowed only
by the relevant “Easy Setup menu” which is the only menu
available for Standard HART version.
Configuration is performed by the on-board buttons which are
present when option “R1” is not selected or by external Z and
S push buttons under nameplate when “R1” is selected.
In addition, diagnostic information is provided.
Important. Integrated LCD display available for Standard HART
version can feature the Zero and Span push buttons. If the
Standard HART version is selected in association with opton R1,
the Zero, Span and Write Protect buttons are installed in the factory
below instrument identification plate, as shown in figure 45.
Figure 48a: Dip switches on integrated LCD display with on-board
buttons and dip switch 3 “up”